I'd be pissed. But it doesn't mention what rifle the so-called 'sniper' fired these through. Could have been an old israeli mauser with excessive headspace and a loose chamber. I'd send the brass back and explainingg that the 'sniper' had better have his barrel set back before he makes any more brass for sale.[:'(]
If you can't do that, I would put in some serious negative feedback in the guy's column.

I don't like to use other people's brass unless its stuff fired from a handgun on the bench next to me from a person who was shooting new ammo and doesn't reload.